CSGP: Company disclosure

Item 7.01 Regulation FD Disclosure. On August 21, 2026, CoStar Group, Inc., a Delaware corporation, issued a press release (the “Press Release”) announcing the completion of its acquisition of Bora, Inc., a Delaware corporation, and its subsidiaries (together, “Zonda”), for $800 million in cash. A copy of the Press Release is hereby furnished as Exhibit 99.1 to this Current Report on Form 8-K. The information contained in this Item 7.01 and in Exhibit 99.1 of this Current Report on Form 8-K shall be considered “furnished” and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that Section or Sections 11 and 12(a)(2) of the Securities Act of 1933, as amended, nor shall it be incorporated by reference to any reports or filings with the Securities and Exchange Commission, whether made before or after the date hereof, except as expressly set forth by specific reference in such a filing. Item 9.01 Financial Statements and Exhibits. Exhibit No. Description 99.1 CoStar Group, Inc. Press Release dated August 21 , 2026. 104 Cover Page Interactive Data File (formatted as inline XBRL and contained in Exhibit 101). SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. COSTAR GROUP, INC. By: Date: August 21, 2026 /s/ Robin Rossmann Name: Robin Rossmann Title: Chief Financial Officer